build(deps): bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/windows_python.yml

@@ -134,7 +134,7 @@ jobs:
       run: |
         mkdir -p spack_installer
         echo "spack_installer=$((pwd).Path)\spack_installer" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf8 -Append
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         name: Windows Spack Installer Bundle
         path: ${{ env.spack_installer }}
@@ -146,7 +146,7 @@ jobs:
         $LASTEXITCODE
       env:
         ProgressPreference: SilentlyContinue
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         name: Windows Spack Installer
         path: ${{ env.spack_installer }}